Table 3 Difference between typical and atypical FAD by ultrasound
Sonographic features | Typical FAD | Atypical FAD |
|---|---|---|
Grey scale imaging | N = 36 | N = 35 |
A. Shape | ||
Oval | 33 (91.7%) | 32 (91.4%) |
Round to irregular | 3 (8.3%) | 3 (8.6%) |
B. Border | ||
Well circumscribed/(lobulated < 3) | 36 (100%) | 24 (68.6%) |
Lobulated (> 3) | 0 | 2 (5.7%) |
Angular | 0 | 5 (14.3%) |
Irregular | 0 | 3 (8.6%) |
Microlobulations | 0 | 1 (2.8%) |
C. Echogenecity | ||
Iso | 26 (72.2%) | 14 (40%) |
Mixed | 9 (25%) | 16 (45.7%) |
Hypo | 1 (2.8%) | 3 (8.6%) |
Hyper | 0 | 2 (5.7%) |
D. Orientation | ||
Wider than taller | 36 (100%) | 31 (88.6%) |
Deeper more than wider | 0 | 4 (11.4%) |
E. Posterior acoustic features | ||
None | 26 (72.2%) | 16 (45.7%) |
Enhancement | 8 (22.2%) | 14 (40%) |
Shadowing | 2 (5.6%) | 5 (14.3%) |
F. Arrangement of vessels | ||
Central | 0 | 7 (20%) |
Peripheral | 7 (19.4%) | 9 (25.7%) |
Both | 0 | 10 (28.6%) |
No | 29 (80.6%) | 9 (25.7%) |
G. Vascularity | ||
Few | 7 (19.4%) | 23 (65.7%) |
Much | 3 (8.6%) | |
No | 29 (80.6%) | 9 (25.7%) |
H. Associated findings | ||
Yes | 1 (2.8%) | 6 (17.1%) |
No | 35 (97.2%) | 29 (82.9%) |